Sense Organs
Sense Organs as Receptors
Sense Organs as Receptors
Receptors are groups of specialised cells
They detect a change in the environment and stimulate electrical impulses in response
Sense organs contain groups of receptors that respond to specific stimuli
Sense Organ | What it is sensitive to | Sense |
|---|---|---|
Skin | Heat and cold, pressure, pain | Touch (pressure) and temperature |
Tongue | Chemicals in food and drink | Taste |
Nose | Chemicals in the air | Smell |
Ear | Sounds and movement | Hearing and balance |
Eye | Light | Sight |
Once the receptor cell in the sense organ has been stimulated, it generates an electrical impulse
This is passed on to a sensory neurone which carries the impulse to the central nervous system
Here a response will be decided on and the impulse will be passed to a motor neurone (via a relay neurone)
The motor neurone carries the impulse to the effector (muscle or gland)
The effector carries out the response